package com.gcb.iterator;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Calendar;

public class HashMapTest {

	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static void main(String[] args) {
		HashMap hashmap = new HashMap();
		for(int i=0;i<1000;i++){
			hashmap.put(""+i,"hello");
		}
	
		long bs = Calendar.getInstance().getTimeInMillis();
		Iterator iterator = hashmap.keySet().iterator();
		//String value = "";
		while(iterator.hasNext()) {
		//value = hashmap.get(iterator.next());
			System.out.println(hashmap.get(iterator.next()));
		}
		System.out.println(Calendar.getInstance().getTimeInMillis() - bs);
		listHashMap();
	}
	
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static void listHashMap(){
		java.util.HashMap hashmap = new java.util.HashMap();
		for(int i=0;i<1000;i++){
			hashmap.put(""+i,"hello");
		}
		long bs = Calendar.getInstance().getTimeInMillis();
		//Set set = hashmap.entrySet() ;
		java.util.Iterator it = hashmap.entrySet().iterator();
		while(it.hasNext()){
			java.util.Map.Entry entry = (java.util.Map.Entry)it.next();
			// entry.getKey() 返回与此项对应的键
			// entry.getValue() 返回与此项对应的值
			System.out.println(entry.getValue());
		}
		System.out.println(Calendar.getInstance().getTimeInMillis() - bs);
	}

}
